feat(bootstrap): setup minimal dotfiles in a devcontainer

Add a script to setup the dotfiles in a devcontainer in order to have
basic stuff at hand, e.g. shell configuration and Neovim and some other
tools.

setup_devcontainer.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+# install starship
+curl -ss https://starship.rs/install.sh -o install_starship.sh
+chmod 755 install_starship.sh
+./install_starship.sh -f
+rm install_starship.sh
+
+# Setup Neovim from appimage
+# see https://github.com/neovim/neovim/blob/master/install.md#install-from-package
+sudo rm -rf /squashfs-root
+curl -LO https://github.com/neovim/neovim/releases/latest/download/nvim.appimage
+chmod u+x nvim.appimage
+./nvim.appimage --appimage-extract
+sudo mv squashfs-root /
+sudo ln -sf /squashfs-root/AppRun /usr/bin/nvim
+rm nvim.appimage
+ln -sf ~/dotfiles/nvim ~/.config/nvim
+
+# setup symlinks
+mkdir -p ~/.{cache,config,local,ssh}
+chmod 700 ~/.{cache,config,local,ssh}
+for foo in bash editorconfig gh git starship.tom yamllint zsh; do
+  ln -sf ~/dotfiles/config/${foo} ~/.config/${foo}
+done
+
+# Setup zsh
+ln -sf ~/dotfiles/config/zsh/zshenv ~/.zshenv
+
+# Setup bash
+cat <<EOF >~/.bashrc
+source  ~/.bash_profile
+EOF
+ln -sf ~/dotfiles/config/bash/profile ~/.bash_profile